Аннотация:The thermodynamic data on the standard Gibbs energies of formation of scandium solid and
aqueous species were collected and systematised. The speciation diagram for the dimerisation reaction 2ScOH 2+ (aq) ⇌ Sc2(OH)2 4+ (aq) was plotted. The equilibria between various hydrolysed scandium (III) species in an aqueous solution were discussed. The potential–pH diagrams of system Sc–H2O at 25°C, air pressure of 1 bar and various activities of ions in a solution were plotted. The influence of possible electrochemical formation of scandium hydride and the effect of non-stoichiometry of scandium sesquioxide on the corrosion-electrochemical
properties of scandium were discussed.
